I am under the impression the all 560Sl's came equipped with posi as a standard feature. Sometimes I think I have one...other times I'm not so sure.

For example, on the dirt ortion of my driveway, both wheels will spin on command. On hard acceleration on pavement, both wheels will laydown massive clouds of blue smoke and spin like crazy. However, if I am turning an tromp on it, only the unloaded tire spins.

Can anyone shed any light on this topic.

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Litton
'90 420 SEL (sold)
'72 280 SEL 4.5
'98 ML320 (for sale)
'86 560SL
'05 Jeep Grand Cherokee Ltd (offroad in style)
'87 Chevy Blazer (AZ Pin Strips)